According to Ohm's law, the current $I$ through a resistor equals what expression in terms of voltage $V$ and resistance $R$?

• A. $I=\frac{V}{R}$
• B. $I=R-V$
• C. $I=\frac{R}{V}$
• D. $I=V\cdot R$

Answer: (A)

Verified step by step guidance

1. Recall Ohm's law, which relates the current \(I\) flowing through a resistor to the voltage \(V\) across it and the resistance \(R\) of the resistor.
2. Ohm's law states that the current is directly proportional to the voltage and inversely proportional to the resistance.
3. Express this relationship mathematically as \(I = \frac{V}{R}\), where \(I\) is the current, \(V\) is the voltage, and \(R\) is the resistance.
4. Understand that this means if you increase the voltage while keeping resistance constant, the current increases, and if you increase resistance while keeping voltage constant, the current decreases.
5. Therefore, the correct expression for current in terms of voltage and resistance is \(I = \frac{V}{R}\).